Power Puff Girls Easter Egg - The Beatles

It is in the episode (sorry, don't remember the title) when Mojo Jojo and other crooks form a gang and name themselves BeatAlls.
This episode has a lot of reference to the Fab Four group (The Beatles):
1. Titles of their songs are used as part of the dialogues.
2. A parody of the group's history is presented (that a girl can cause damage and make them fall apart, thus making them vulnerable).
3. A parody of the most famous album cover by The Beatles is shown in one point during the episode ("The Abbey Road" - crossing the street on the zebra).

But most of all:

When Mojo and his new girl-monkey are enjoying screaming and in this way causing crime...whatever...the cartoon Beatles themselves can be seen as shown in their own cartoon "Yellow Submarine".